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SIO BOARD
RS232 LEVELS
AA
^
1
chassis ground
BA
2
3
Trans. Data
3
5
BB
Rec. Data
7
CA
^
Req.
CB
®
9
O r. to Send
CC
®
1 ^
Data Set Rdy.
7
AB
s
1 3
signal ground
CF
3
1 5
Carrier Det.
9
1 7
*
1 0
19
11
2 1
1 2
2 3
1 3
2 5
1 4
2
4
DB
1®
Trans. CJk.
16
6
17
8
D D
Rec. Clk.
1 8
10
1 9
1 2
3 9
1 4
C D
Data Term.
2 1
1 6
2 2
18
2 3
2 0
2 4
2 2
2 5
2 4
I/O PIN DEFINITIONS
T T L
LEVELS
to
Send
v
Data Term. Rdy.
Dan Set Rdy.
Oata Out
Data In
Rdy.
S IO 2
USER'S GUIDE
REVISION 1
CURRENT LOOP
+ V
+ • Current Source
In
Loop *
Out
Loop +
Out
Loop —
Current sink 1
Current sink 2
In Loop —
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